from manim import *
class work3(MovingCameraScene):
    def construct(self):
        self.camera.background_color = BLACK  # 设置背景颜色
        self.camera.frame_width = 100  # 设置边框宽度
        self.camera.frame_height = 60  # 设置边框高度
        self.camera.pixel_height = 1080  # 设置像素高度
        self.camera.pixel_width = 1920  # 设置像素宽度
        self.camera.center = ORIGIN  # 设置中心点位置
        self.camera.scale_factor = 1.0  # 设置缩放因子
        #设置横线
        for i in range(60*2+1):       
            dot1=Dot([-500,5*(i-60),0]).set_opacity(0.5)
            dot2=Dot([500,5*(i-60),0]).set_opacity(0.5)
            if i==6:
                line1=Line(dot1,dot2).set_color(WHITE).set_opacity(0.5)
                
            else:
                line1=Line(dot1,dot2).set_color(WHITE).set_opacity(0.5)
               
            self.add(dot1,dot2,line1)
        #设置竖线
        for i in range(100*2+1):        
            dot3=Dot([(i-100)*5,-300,0]).set_opacity(0.5)
            dot4=Dot([(i-100)*5,300,0]).set_opacity(0.5)
            if i==10:
                line2=Line(dot3,dot4).set_color(WHITE).set_opacity(0.5)
                
            else:
                line2=Line(dot3,dot4).set_color(WHITE).set_opacity(0.5)
            self.add(dot3,dot4,line2)
        #设置三个点
        dot1 = Dot(radius=1, color=RED)  
        dot1.move_to([-47.5,27.5,0]) 
        dot2 = Dot(radius=1, color=YELLOW)  
        dot2.move_to([-42.5,27.5,0])  
        dot3 = Dot(radius=1, color=GREEN)  
        dot3.move_to([-37.5,27.5,0])
        #镜头跟进效果 
        self.camera.frame.save_state()
        #题目出现
        text = Tex(r"\text{导函数独有的三大性质之一：}",color=YELLOW
                   
                   ,tex_template=TexTemplateLibrary.ctex).scale(5.0).move_to([0,25,0])
        text1 = Tex(r"\text{若}$f\left( x\right) $\text{在区间}$I$\text{处处可导，且导函数为}$f'\left( x\right) $"
                   
                   ,tex_template=TexTemplateLibrary.ctex).scale(5.0).move_to([0,15,0])
        text2 = Tex(r"\text{则}$f'\left( x\right) $\text{可能存在震荡间断点，不可能存在可去，跳跃，无穷间断点}"
                   
                   ,tex_template=TexTemplateLibrary.ctex).scale(5.0).move_to([0,10,0])
        dot10=Dot([-45,20,0])
        dot20=Dot([45,20,0])
        line=Line(dot10,dot20).set_color(GREEN)
        line.set_stroke(width=30)  # 设置宽度为 30
        
        self.play(Write(text),Create(line))
        self.play(Write(text1),Write(text2))
        self.wait()
        #镜头拉回
          #分析文本
        #text100=MarkupText("<b><i>分析/解：</i></b>",color=PINK).scale(5.0).move_to([-38,12.5,0])
        
        self.play(FadeIn(dot1),run_time=0.1)
        self.play(FadeIn(dot2),run_time=0.1)
        self.play(FadeIn(dot3),run_time=0.1)
        #题目向上移动
        text3 = Tex(r"\text{如果}$f\left( x\right) $\text{有原函数}"
                   
                   ,tex_template=TexTemplateLibrary.ctex).scale(5.0).move_to([0,0,0])
        self.play(Write(text3))
        text4 = Tex(r"\text{那么}$f\left( x\right) $\text{就是别人的导数}"
                   
                   ,tex_template=TexTemplateLibrary.ctex).scale(5.0).move_to([0,-5,0])
        self.play(Write(text4))
        
        #下划线
        dot1=Dot([10,8,0])
        dot2=Dot([38,8,0])
        line=Line(dot1,dot2).set_color(YELLOW)
        line.set_stroke(width=30)  # 设置宽度为 30
        self.play(Create(line))
        self.wait()